[PATCH v3 10/13] drm/i915/xehp: Don't support parallel submission on compute / render

[Matt Roper]

From: Matthew Brost <matthew.brost at intel.com>

A different emit breadcrumbs ring programming is required for compute /
render and we don't have UMD user so just reject parallel submission for
these engine classes.

Signed-off-by: Matthew Brost <matthew.brost at intel.com>
Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
---
 drivers/gpu/drm/i915/gem/i915_gem_context.c         | 10 ++++++++++
 drivers/gpu/drm/i915/gt/uc/selftest_guc_multi_lrc.c |  4 ++++
 2 files changed, 14 insertions(+)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index bc6d59df064d..9ae294eb7fb4 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -670,6 +670,16 @@ set_proto_ctx_engines_parallel_submit(struct i915_user_extension __user *base,
 				goto out_err;
 			}
 
+			/*
+			 * We don't support breadcrumb handshake on these
+			 * classes
+			 */
+			if (siblings[n]->class == RENDER_CLASS ||
+			    siblings[n]->class == COMPUTE_CLASS) {
+				err = -EINVAL;
+				goto out_err;
+			}
+
 			if (n) {
 				if (prev_engine.engine_class !=
 				    ci.engine_class) {
diff --git a/drivers/gpu/drm/i915/gt/uc/selftest_guc_multi_lrc.c b/drivers/gpu/drm/i915/gt/uc/selftest_guc_multi_lrc.c
index 1297ddbf7f88..812220a43df8 100644
--- a/drivers/gpu/drm/i915/gt/uc/selftest_guc_multi_lrc.c
+++ b/drivers/gpu/drm/i915/gt/uc/selftest_guc_multi_lrc.c
@@ -154,6 +154,10 @@ static int intel_guc_multi_lrc_basic(void *arg)
 	int ret;
 
 	for (class = 0; class < MAX_ENGINE_CLASS + 1; ++class) {
+		/* We don't support breadcrumb handshake on these classes */
+		if (class == COMPUTE_CLASS || class == RENDER_CLASS)
+			continue;
+
 		ret = __intel_guc_multi_lrc_basic(gt, class);
 		if (ret)
 			return ret;
-- 
2.34.1